Molar mass conversion to carats Steps:

• Recognize 6.02 × 10^{23} carbon atoms as 1 mole.
• Calculate mass of 1 mole: 12.0 g (molar mass of carbon).
• Note 1 carat = 0.200 g.
• Divide total mass by mass per carat: 12.0 / 0.200. Why B is correct:
• It directly computes carats in 12.0 g, the mass containing 6.02 × 10^{23} atoms, via mass per carat. Why the others are wrong:
• A: 0.200 × 12.0 yields grams, not carats.
• C: 0.200 / 12.0 gives carats per gram, irrelevant here.
• D: 6.02 × 10^{23} / 12.0 yields atoms per gram, not carats.

Final answer: B